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Keen, E.M.: ¬The Aberystwyth index languages tests (1973)
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Keen, E.M.: Prospects for classification suggested by evaluation tests (1976)
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Keen, E.M.: On the generation and searching of entries in printed subject indexes (1977)
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Keen, E.M.: Presenting results of experimental retrieval comparisons (1992)
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Keen, E.M.: Some aspects of proximity searching in text retrieval systems (1992)
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Hartley, D.: ¬A 'laboratory' method for the comparison of retrieval effectiveness in manual and online searching (1984)
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Martin, M.: Compact disc media evaluation : what we now know about disc quality (1993)
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Keen, E.M.: Interactive ranked retrieval (1995)
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Airio, E.: Who benefits from CLIR in web retrieval? (2008)
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Chen, H.; Ng, T.: ¬An algorithmic approach to concept exploration in a large knowledge network (automatic thesaurus consultation) : symbolic branch-and-bound search versus connectionist Hopfield Net Activation (1995)
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